function is_linear_whitespace()
{
return (bool) ($this->data[$this->position] === "\t" || $this->data[$this->position] === " " || $this->data[$this->position] === "\n" && isset($this->data[$this->position + 1]) && ($this->data[$this->position + 1] === "\t" || $this->data[$this->position + 1] === " "));
}